JPH06159150A - Injector used for internal combustion engine - Google Patents

Abstract

PURPOSE: To use a medium such as water in an air supply conduit at low cost. CONSTITUTION: A liquid tank 9 is connected to an atomizer 6 via a feed controller 7. The atomizer is positioned in an air supply conduit 2. Thus, a liquid-air mixture is formed in the air supply conduit 2 and can be supplied to the fuel injected by an injection valve 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device used in an internal combustion engine, the injection valve having an air enclosing portion, an intake passage, and an adjustable intake passage arranged in the intake passage. It is of the type provided with a throttling mechanism and an air supply conduit for supplying air for the air enclosure of the injection valve.

[0002]

2. Description of the Related Art German Patent Publication No. 324
In the already known fuel injection valve according to the specification of 0554, an air enclosure for enclosing the injected fuel with air is provided in the fuel injection opening. The air surrounding portion provided in the injection valve supplies air directly to the injection opening of the injection valve,
As a result, the fuel that flows out is surrounded by air,
Helps to prepare immediately.

Furthermore, a liquid mixing and injection device for internal combustion engines is already known from DE-A-2252307. In this liquid mixture injection device, a liquid different from the fuel, for example, water is mixed with the fuel in the injection nozzle and injected together into the combustion chamber. The use of a liquid other than fuel, for example water, results in a reduction in the combustion temperature of the injected fuel. Furthermore, the water injection also results in a clear reduction of nitrogen oxides in the combustion gas.

In another known water injection device, water is supplied to the fuel injection openings, in which case water mist forms directly around the flame in the combustion chamber. This requires, at a considerable cost, an additional injection system with a separate water passage or its own water injection valve.

[0005]

SUMMARY OF THE INVENTION The object of the invention is to improve an injector of the type mentioned at the outset by providing an injector in which a medium, for example water, is used inexpensively in existing air supply conduits. It is to be.

[0006]

In order to solve this problem, in the structure of the present invention, a liquid tank is connected to an atomizer via a metering device, and the atomizer is connected to an air supply conduit. Located so that a liquid-air mixture is formed in the air supply conduit so that it can supply the fuel injected by the injector.

[0007]

The injector according to the present invention has the following advantages over the conventional one. That is, it is possible to realize an inexpensive liquid injection for an internal combustion engine. In this case, the existing air enclosure of the injection valve is also used for the supply of liquid to the fuel injection opening. The additional separate injection system required in the known liquid injection device with its own liquid injection valve is completely dispensed with in the construction of the invention. The reason is that the liquid-air mixture is already provided to the air envelope of the injection valve via the atomizer. Based on the fact that the liquid-air mixture is injected into the combustion chamber of the internal combustion engine via the air enclosure of the injection valve, and at the same time the fuel is injected from the injection valve to form a mixture of fuel, liquid and air. Allows the use of the λ = 1 concept. That is, the amount of supplied air corresponds to the amount of air that is theoretically required to completely burn the fuel in the entire operating region of the internal combustion engine, particularly the mixture compression type spark ignition internal combustion engine. This is especially true in the operating region near the full load of a supercharged internal combustion engine.

Advantageous refinements of the injection valve according to claim 1 are obtained by the measures as defined in claim 2.

It is particularly advantageous if a metering device is used between the liquid tank and the atomizer. This makes it possible to control the amount of liquid to be atomized. The metering device receives the necessary signals from the control device. That is, for example, in the partial load region below the internal combustion engine, it is possible to control the metering device so that the liquid injection is blocked.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

The present invention relates to an injector for use in a mixture compression type spark ignition type internal combustion engine having an injection valve having an air envelope. The injection device according to the invention is distinguished by a device for forming a liquid mist in the air supply conduit, which is placed in front of the injection valve and which is required to enclose the injection valve with air. In the drawing, a corresponding injection device is shown. With respect to the injection device 1, a wide variety of already known injection valve constructions with an air envelope can be used, so an exact illustration of the injection valve 1 is avoided. Such injection valves with an air envelope are known, for example, from DE-A-3240554 or U.S. Pat. No. 4,545,354, so a detailed description is omitted.

As in the case of the already known injection device used in internal combustion engines, in the injection device according to the invention,
The air supply of the fuel injected by the injection valve 1 to the air enclosure 11 is performed by the air supply conduit 2.
This air supply conduit 2 ends in the immediate vicinity of the injection end 16 of the injection valve 1. In this case, the supplied air is directed at the injected fuel. The intake air for the internal combustion engine is supplied, for example, via a circular intake passage 10. A throttle valve 4 that functions as a throttle mechanism is located in the intake passage 10, and this throttle valve controls the intake air flow of an internal combustion engine (not shown). The air supply conduit 2 is branched from the intake passage 10 in front of the throttle valve 4 when viewed in the flow direction of the intake air, and is continuously supplied with the intake air by the intake passage 10 which is always in communication when the internal combustion engine is operating. Is configured. The intake passage 10 is a combustion chamber 1 of an internal combustion engine.
When viewed in the direction of 5, the intake manifold pipe 3 is opened behind the throttle valve 4. This collective suction pipe serves for air distribution to the individual combustion chambers 15 of the internal combustion engine.
The injection valve 1 for injecting fuel into the combustion chamber 15 includes an intake passage 1
0 is arranged in the range of the intake valve 14.

An atomizer 6 is incorporated in the air supply conduit 2 between the intake passage 10 and the air enclosure 11 of the injection valve 1. The air present in the air supply conduit 2 which is required for optimizing the mixture formation is added by the atomizer 6 with a liquid different from the fuel, such as water, antifreeze water or the like. Therefore, at the injection end 16 of the injection valve 1, a mixture of liquid, air and fuel is formed,
It is injected into the intake passage 10. The atomizer 6 may be formed in various configurations. The simplest embodiment for forming the atomizer 6 is a single nozzle plunging into the air supply conduit 2. This single nozzle makes it possible to obtain a liquid mist in the air stream of the air supply conduit 2. Furthermore, the atomizer 6 can also be formed, for example, by a small tube provided with a plurality of nozzle-like openings for liquid outflow. A sufficient air supply is ensured by a feed device, for example an electric air pump 5, which is connected to the air supply conduit 2 between the atomizer 6 and the air enclosure 11 of the injection valve 1. The electric air pump 5 provides a sufficiently high air flow for supplying air to the air enclosure 11 of the injection valve 1, even in the operating region near the full load of the internal combustion engine. This air flow in the air supply conduit 2 is supplied with liquid via the atomizer 6 in relation to various operating parameters, such as rpm, load and knocking signal, especially in the operating region near full load. It

The operating parameters are supplied to the electronic control unit 8. This electronic control unit controls the metering device 7. Since this metering device is placed in front of the atomizer 6 in order to influence the liquid quantity, an optimum mixing ratio can be obtained in the injection valve 1. The metering device 7 and the atomizer 6 are connected by a first liquid conduit 13A. This first liquid conduit provides liquid supply to the atomizer 6 located in the air supply conduit 2. The metering device 7, which is controlled by the electronic control device 8, is formed, for example, by a valve. Corresponding to the signals input to the electronic control unit 8 and the evaluation of these signals, such as are formed from the operating parameters of the internal combustion engine, the valve opening and closing mechanism of the metering unit 7 is controlled by the electronic control unit 8. Affected by the position, it delivers the required amount of liquid to the first liquid conduit 13A in the direction of the atomizer 6. The amount of liquid to be adjusted is prepared by the liquid tank 9. This liquid tank is directly connected to the metering device 7. Second
In the liquid conduit 13B, liquid is supplied from the liquid tank 9 to the metering device 7. Depending on the spatial arrangement of the liquid tank 9 in the internal combustion engine, liquid transport is guaranteed in a wide variety of forms. Besides a simple drop flow arrangement, it is also possible to use a feed pump for supplying liquid to the metering device 7. The amount of liquid required for optimum mixture formation at all times is about 5% of the amount of fuel. There is also a need to fill the liquid tank 9 after a time corresponding to the fuel consumption.

The electronic control unit 8 takes over not only the control of the metering unit 7 but also the control of the electric air pump 5. Therefore, based on the variation of various operating parameters, liquid-
There is always the possibility of changing the quantitative composition of the air mixture. That is, it is conceivable, for example, to interrupt the liquid supply via the metering device 7 by the electronic control device 8 in the lower partial load region. In this case, the injection valve 1 is formed with a substantially pure air enclosure 11 without liquid mist. The liquid injection type according to the invention in an internal combustion engine, preferably a spark-ignition internal combustion engine of the mixture compression type, is distinguished by its inexpensive realization. An injection device with an injection valve having an air enclosure enables a cheap installation of a liquid injection system. Because a separate injection system with its own liquid injection valve is not required.
Instead, the air supply system only has to be supplemented by the liquid tank 9, the metering device 7 and the atomizer 6, which are the components of the liquid supply.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an injection device according to the present invention.

[Explanation of Codes] 1 injection valve, 2 air supply conduit, 3 intake manifold, 4 throttle valve, 5 air pump, 6
Atomizer, 7 Metering device, 8 Electronic control device, 9
Liquid tank, 10 intake passage, 11 air enclosure, 13A, 13B liquid conduit, 15 combustion chamber,
16 Jet end

Claims (6)

[Claims] 1. An injection device for use in an internal combustion engine, comprising: an injection valve having an air enclosure; an intake passage; an adjustable throttle mechanism arranged in the intake passage; In the type provided with an air supply conduit for supplying air for the air enclosure of the valve, a liquid tank (9) is provided with an atomizer (6) via a metering device (7). And the atomizer is located in the air supply conduit (2), whereby a liquid-air mixture is formed in the air supply conduit (2) and the injection valve (1)
An injector for use in an internal combustion engine, characterized in that it can supply fuel injected by the engine. 2. Liquid addition by means of said metering device (7)
Electronic control unit for operating parameters of internal combustion engine (8)
The injection device according to claim 1, which is controllable by: 3. The atomizer (6) in the air supply conduit (2).
Injector according to claim 1, characterized in that a feed device (5) is arranged downstream of the. 4. The injection device according to claim 3, wherein the feed device (5) and the metering device (7) are adapted to obtain control signals from the same electronic control device (8). 5. An air supply conduit (2) is provided in front of the throttle mechanism (4) in the intake conduit (1) when viewed in the flow direction of the intake air.
0) The injection device according to any one of claims 1 to 3, which branches from 0). 6. The liquid addition is adapted to be interrupted by the electronic control unit (8) via the metering device (7) in a predetermined operating range of the internal combustion engine.
The injection device described.